Will you be fined for wearing Nike shoes when traveling to Europe?

No, first of all, your shoes are your property, even if they are knockoffs, they have nothing to do with you. You are just a consumer and a victim.

The Property Law stipulates that private property of individuals is not allowed to be inquired by others.

If you are a star and endorse other brands of sports shoes, you may be sued by the merchants. If you are an influential star, the European Union bans Nike trademarks from entering, you may be banned, but there seems to be no precedent for this.